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Finding the Fourth Proportional to 547.28, 754.50 and 390.02

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Solution

The fourth proportional to 547.28, 754.50 and 390.02 is: 537.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.28 : 754.50 = 390.02 : x
  2. Step 2: Convert to fraction form
    547.28/754.50 = 390.02/x
  3. Step 3: Cross multiply
    547.28x = 754.50 × 390.02
  4. Step 4: Simplify right side
    547.28x = 294,270.09
  5. Step 5: Solve for x
    x = 294,270.09/547.28
  6. Step 6: Final answer
    x = 537.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.